Lp mailers www.bagsunlimited.com
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I have shipped via USPS (the horror, the horror) 150 LPs in super heavy duty booze boxes. Get them at a BIG booze retailer. You might have to go and ask in advance... explain what you want them for and if they are willing, they may save you a bunch. They are good for two cross country trips via USPS before they began to break up. Pack 'em really tight and firm and you are set.